US 9,811,058 B2
Apparatus and method for controlling input signal
Jung Wook Kim, Cheonan-si (KR)
Assigned to LSIS CO., LTD., Anyang-si (KR)
Filed by LSIS CO., LTD., Anyang-si, Gyeonngi-do (KR)
Filed on May 1, 2013, as Appl. No. 13/875,183.
Claims priority of application No. 10-2012-0066736 (KR), filed on Jun. 21, 2012.
Prior Publication US 2013/0345830 A1, Dec. 26, 2013
Int. Cl. G05B 15/02 (2006.01); G05B 19/042 (2006.01)
CPC G05B 15/02 (2013.01) [G05B 19/0423 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An apparatus for controlling a signal such that a programmable logic controller (PLC) input signal is equalized to a reference input signal, the apparatus comprising:
a first filter configured to generate a PLC output signal by removing a noise of the PLC input signal and allowing a specific frequency signal of the PLC input signal to be passed or to be blocked;
a second filter configured to generate a reference output signal by removing a noise of the reference input signal and allowing a specific frequency signal of the reference input signal to be passed or to be blocked;
an error calculation circuit receiving the PLC output signal and the reference output signal, and configured to generate an error signal by calculating a difference value between the PLC output signal and the reference output signal;
a first multiplier circuit to multiply the reference input signal and the error signal to generate a first multiplication result;
a first amplifier to amplify the first multiplication result at a first gain to generate a first amplification result;
a first integrator circuit to integrate the first amplification result to generate the first estimation parameter;
a second multiplier circuit to multiply the PLC output signal and the error signal to generate a second multiplication result;
a second amplifier to amplify the second multiplication result at a second gain to generate a second amplification result;
a second integrator circuit to integrate the second amplification result to generate the second estimation parameter; and
an error correction circuit configured to correct the error signal of the PLC input signal by generating a next PLC input signal that is equalized to the reference input signal, wherein the correction of the error signal of the PLC input signal is based on the first and second estimation parameters.